The contraption – which is basically a fancy animal-operated Etch-a-Sketch – runs on hamster power and works like this: Joji jumps into his little wheel and runs like a madman, which in turn powers a Raspberry Pi computer. This sends commands to a motor to control the speed of the machine as the Joji jogs out his stress.

All artistic labour is voluntary and the benefits are two-fold – Joji is a healthy happy hamster and we get unique works of art.